I have an HP P7-1446S computer running Windows 8 64 bit. I installed a second DVD drive in the computer (LG BH12). When the computer goes into sleep mode, when I awake the computer the 2nd dvd drive is gone. When I reboot the computer both drives show up. They show as Drive E (the original DVD drive) and Drive F (the LG drive). I checked the cables and everything is fine it seems. Anyone have any ideas? This is very frustrating!!!